<html>

<style>
    * {
        margin: 0;
    }

    #content {
        color: white;
        position: absolute;
        left: -20px;
        top: -10px;
        white-space: pre-wrap;
        height: 200px;
        overflow: auto;
    }
</style>

<script type="importmap">
	{
	  "imports": {
		"three": "../../three.js-r151/build/three.module.js",
		"three/addons/": "../../three.js-r151/examples/jsm/"
	  }
	}
</script>

<body>
    <div id="content">
        <a href="http://www.webgl3d.cn/pages/2e5d69/">scene</a> 
        <a href="http://www.webgl3d.cn/pages/c0b143/">camera</a> 
        <a href="http://www.webgl3d.cn/pages/b483f0/">render</a> <br/>
        2023-4-22
    </div>
    <div id="canvas"></div>

    <script type="module">
        import * as THREE from 'three';
        import { OrbitControls } from 'three/addons/controls/OrbitControls.js';

        // 1. 必须创建的三大件
        // 1.1 三维场景Scene, 类似创建了个世界，三维世界
        const scene = new THREE.Scene();
        // 世界里面需要add物体
        const geometry = new THREE.BoxGeometry(1, 1, 1);
        // const material = new THREE.MeshBasicMaterial({ color: 'yellow' });
        const material = new THREE.PointsMaterial({ color: 'yellow' });
        const cube = new THREE.Mesh(geometry, material);
        //设置网格模型在三维空间中的位置坐标，默认是坐标原点
        cube.position.set(0, 0.5, 0);
        scene.add(cube);

        // 添加辅助坐标系
        const axesHelper = new THREE.AxesHelper(5);
        scene.add(axesHelper);

        // 1.2 相机
        const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
        camera.position.set(3, 3, 3)

        // 1.3 渲染器
        const renderer = new THREE.WebGLRenderer();
        renderer.setSize(window.innerWidth, window.innerHeight);
        let canvasDom = document.getElementById("canvas");
        canvasDom.appendChild(renderer.domElement);
        
        // 2. 设置相机控件轨道控制器OrbitControls
        const controls = new OrbitControls(camera, canvasDom);
        // 如果OrbitControls改变了相机参数，重新调用渲染器渲染三维场景
        controls.addEventListener('change', function () {
            renderer.render(scene, camera); //执行渲染操作
        });//监听鼠标、键盘事件


        renderer.render(scene, camera);
    </script>
</body>

</html>